Teac A-3340 Manuale utente

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TEAC

2:33%9

SERVICE

MANUAL

1.GENERAL

DESCRIPTION

The

TEAC

A-3340

is

a

semi-professional

tape deck

capable

of

Simul-syne

recording,

Quadriphonic,

Stereophonic

and

mono-

-

phonic

recording

and

playback.

It

offers

operating

speeds

of

7-1/2

and

15

ips

and

will

accept

reels

of

10-1/2

inches

in

diameter.

The

Simul-sync

feature

permits

the

recording

of

discrete

but

synchronized

program

material

on

all

four

tape

tracks.

The

TEAC

A-3300

is

a

semi-professional

tape

deck

capable

of

Stereophonic

and

Monophonic

recording

and

playback.

It

is

available

in

three

configurations

and

offers

operating

speeds

of

either

3-3/4

and

7-1/2

ips,

or

7-1/2

and

15

ips.

The

transport

mechanisms

of

the

A-3300

and

A-3340

are

iden-

tical

with

the

exception

of

operating

speeds

and

head

con-

figurations.

This

service

manual

provides

adjustment

and

alignment

pro-

cedures,

schematic

diagram

and

parts

replacement

informa-

tion

and

the

proper

procedures

for

obtaining

necessary

re-

pair

parts.

If

adjustments

or

repair

procedures

are

not

clear

or

seem

difficult

to

accomplish

or

should

you

desire

more

detailed

technical

information,

please

contact

your

nearest

TEAC

dealer,

TEAC

Corporation

or

affiliated

corporations,

ad-

dress's

of

which

are

printed

in

this

manual.

INDEX

GENERAL

DESCRIPTION

SERVICE

DATA

.

EQUIPMENT

REQUIRED

PARTIAL

DISASSEMBLY

.

HEAD

ALIGNMENT

-MECHANICAL-

.

MEASUREMENT

AND

ADJUSTMENT

-MECHANICAL-

A-3300/MEASUREMENT

AND

ADJUSTMENT

-ELECTRICAL-

A~3340/MEASUREMENT

AND

ADJUSTMENT

-ELECTRICAL-

PREVENTIVE

MAINTENANCE

TROUBLE

SHOOTING

.

PACKING

FOR

SHIPMENT

EXPLODED

VIEW

AND

PARTS

LIST

‘PRINTED

CIRCUIT

BOARD PARTS

LIST

SCHEMATIC

DIAGRAMS

MANUAL

CHANGES

oy

oO

ON

DU

FSF

W

NY

BoE

H

oO

MECHANICAL

A-3300

Heads:

Tape

Width:

Tape

Speed:

Motors:

Wow

and

Flutter:

Fast

Winding

Time:

Power

Requirements:

-

Weight:

A-

3340

Type:

Heads:

Reel

Size:

Tape

Width:

Tape

Speed:

Wow

and

Flutter:

WEIGHT:

2.

SERVICE

DATA

Three,

4

track

2

channel

or

2

track

2

channel

stereophonic.

Erase,

Record

and

playback.

Erase

head,

1.8k2/100kHz,

erase

current

approx.

30mA

Record

head,

1kQ/1kHz,

bias

current

approx.

2mA

©

Playback

head,

3kQ/1kHz

-53dB

Standard

1/4

inch

tape

15ips

(A~3300-11),

7-1/2ips

and

3-3/4ips

Two

6-pole

eddy

current

motors

for

reel

drive.

4/8

pole

hysteresis

synchronous

capstan

motor

Playback

Overall

0.15%

for

1l5ips

0.18%

for

7-1/2ips

0.20%

for

3-3/4ips

Approx.120

seconds

for

10"

reel

(2,400

ft)

100/117/200/220/240V

AC

50/60Hz

44

lbs

(20kg)

net.

Four

track

4

channel

stereophonic

Four

track

2

channel

stereophonic

Four

track

1

channel

monophonic

Three:

Erase(Ferrite),

Record,

Playback

(Permalloy)

10-1/2"

maximum

NAB

reel

Standard

1/4

inch

tape

15ips

and

7-1/2ips

(0.5%)

0.06%

at

15ips

0.08%

at

7-1/2ips

49.5

lbs

(22.5kg)

The

following

chart

lists

the

differences

by

number

A-3300

5

-10,-11,-12

and

A-3340.

A~

3300-10

TAPE

SPEED

7-1/2ips,

3-3/4ips

HEAD

CONFIGURATION

4T

4T

2

Channel

A-3340

A-3300-11

15ips,

7-1/2ips

4T

4T

4T

4

Channel

2T

2T

2T

Half

Track

2T.

2T

2T

Half

Track

A-3300-12

|

J-1/2ips,

3-3/4ips

&

Ge

ele

ee

ELECTRICAL

A-3300

;

Transistors:

Diodes:

2SC1000(BL)

x

2

28C693(GU)

x

2

2SA6661I(S)

x

2

2SC644(T)

x

4

28C828(S)

x

8

2SC971

x

2

28C536(F)

x

2

FR2-06

x

4

FR2-10

x

1

Frequency

Response:

15ips

30Hzv22kHz+3

7-1/2ips

40H2v18kHz+3

3-3/4ips

50Hzv10kHz+3

Signal

to

Noise

Ratio:

Il5ips

52dB

or

more

Input:

Output:

Bias

Frequency:

7-1/2ips

48dB

or

more

3-3/4ips

45dB

or

more

(unweighted)

MIC:

0.3mV/10k2

LINE:

0.1V/100kQ

LINE:

approx.

0.3V/10kQ

or

more

HEADPHONE:

0.3mW/8Q2

100+5kHz

push-pull

oscillator

Crosstalk

Rejection:

35dB

adjacent

track

at

100Hz

Channel

Separation:

60dB

channel

to

channel

at

1kHz

Erase

Efficiency:

60dB

or

more

at

7-1/2ips

or

15ips

speed

ELECTRICAL

A~3340

0000

——

Frequency

Response:

Frequency

Response

at

SIMUL

SYNC:

Signal

to

Noise

Ratio:

Crosstalk

Rejection:

Channel

Separation:

15ips

30HzV22kHz

+£3dB

7-1/2ips

40Hzv18kHz

+3dB

15

&

7-1/2ips

30H2v7.5kHz

+10dB

15

&

7-1/2ips

50dB

or

higher

(unweighted)

46dB

adjacent

track

at

1kHz

43d4B

channel

to

channel

at

1kHz

NOTE

As

a

result

of

continuing

changes

and

improvements

during

the

production

run,

minor

differences

may

be

found

between

early

and

later

machines.

Refer

to

manual

change

sheets

for

information

concerning

modifications.

3.

EQUIPMENT

REQUIRED

FOR

MECHANICAL

MEASUREMENT

oo

SPRING

SCALE:

0v3kg

(008

lbs)

0%300¢

(010

oz)

TEST

TAPE:

TEAC

YTT-2004

(15

ips).

TEAC

YTT-2003

(7-1/2ips)

TEAC

YTT-2002

(3-3/4ips)

FLUTTER

METER:

SENTINEL

INC

FL-3D-1

DIGITAL

FREQ.

COUNTER:

Capable

of

0

to

5kHz

indication

TOOLS:

General,

2mm

nut

driver,

Hex

head

Allen

wrench

:

Xe

5

ze

7

TEAC

VEST

TAPE

Spring

Scale

TEAC

Hex

Allen

Wrench

TEAC

Test

Tapes

FOR

ELECTRICAL

MEASUREMENT

TEST

TAPE:

TEAC

YTT-1004

for

15ips

TEAC

YTT-1003

for

7-1/2ips

TEAC

YTT-1002

for

3-3/4ips

SCOTCH

203

and

150

for

recording

test

EMPTY

REEL:

TEAC

RE-702(2"

hub)

TEAC

RE-701(4"

hub)

TEST

SET:

TEAC

M-826A

test

set

BAND

PASS

FILTER:

TEAC

M-206A

(1kHz)

VTVM:

hp

model

4302B

or

equivalent

RESISTOR:

Non

inductive

type

8

ohm/1W

OSCILLOSCOPE:

General

purpose

NOTE

Use

of

the

TEAC

M-826A

test

set

is

recommended.

This

set

incorporates

an

AC

VIVM,

Audio

Oscil-

lator,

Channel

Selecting

switch,

Variable

At-

tenuator,

Monitor

Speaker

and

Cables.

..

TEAC

M-826A

measures

the

RMS

value

of

the

Volt-

age(O

dB

=

0.775

V).

Characteristics

of

this

test

set

are

similar

to

the

standard

VU-meter.

TEAC

Test

Set

REMOVING

THE

REAR

PANEL

AND

WOODEN

SIDES

1.

Loosen

the

four

screws

on

each

wooden

side.

2.

Remove

the

six

screws

holding

the

rear

panel.

3.

Lift

off

rear

panel.

4,

Remove

the

eight

screws

in

the

two

wooden

sides.

5.

Remove

the

wooden

sides.

D-0379

Fig.

4-1

Removing

Wooden

Sides

REMOVING

THE

BOTTOM

PLATE

1.

Place

the

unit

upside

down.

2.

Remove

the

three

screws

in

the

bottom

plate.

3.

Lift

off

bottom

plate.

0-0380

Fig.

4-2

Removing

Rear

Panel

and

Bottom

Plate

*A11

amplifier

checks

and

adjustments

can

be

made

from

the

bottom

with

the

plate

removed.

;

‘CAUTION

These

adjustments

should

be

performed

by

experienced

technicians,

and

then

only

when

going

through

the

complete

test

and

check

pro-

cedures

on

the

unit

which

is

being

tested.

HEAD

REPLACEMENT

CAUTION

Power

to

the

unit

must

be

switched

off

when

removing

the

heads,

this

will

prevent

transient

pulses

from

passing

through

the

heads

causing

strong

magnetization

or

damage

to

the

delicate

windings.

After

head

replacement,

thorough

demagnetization

is

recommended.

NOTE

The

heads

of

the

A-3300/3340.can

be

changed

either

as

a

complete

assembly

or

individually

as

required.

HEAD

ASSEMBLY

REPLACEMENT

To

change

the

head

assembly

as

a

unit,

remove

the

two

mounting

screws,

(one

on

each

end).

Note

the

positions

of

the

wires

on

the

circuit

board

before

unsoldering.

Solder

the

wires

of

the

new

assembly

in

exactly

the

same

positions.

Fig.

4-3

Head

Assy

INDIVIDUAL

HEAD

REPLACEMENT

To

replace

a

single

head,

a

special

2mm

:

on

*

nut

driver

is

required.

Remove

the

two

nuts

on

the

defective

head

through

the

access

hole

provided,

this

releases

the

head

from

the

mounting

plate.

Note

the

position

of

the

wires

on

the

circuit

board.

.Connect

the

new

head

in

the

same

manner.

Replace

the

nuts

securing

the

new

head

to

the

plate,

perform

head

alignment

before

operation.

Head

installation

mounting

provides

for

left

or

right

positioning.

After

in-

stalling

heads,

determine

proper

posi-

tion

while

recording

or

playing

back

a

tape.

Fig.

4-4

Individual

Heads

REMOVAL

OF

CAPSTAN

MOTOR

_1.

Remove

the

three

screws

hold-

ing

the

capstan

motor

(top).

2.

Unsolder

the

six

wire

connect-

ing

the

capstan

motor.

3.

Remove

the

four

screws

holding

the

capstan

motor

(bottom).

4.

Loosen

the

two

set

screws

(hex

head)

in

pulley

and

lift

off

pulley.

UY

REMOVAL

OF

CAPSTAN

ASSY

NOTE

A

clearance

of

0.01"

must

main-

tained

between

the

flywheel

and

capstan

assembly.

1.

Unscrew

capstan

cover

(front

panel).

2.

Remove

two

screws

from

rear

bracket,

allow

bracket

to

drop

toward

floor

of

case.

.

Remove

capstan

belt.

.

Loosen

two

screws

in

capstan

assy

flywheel.

Remove

flywheel.

5.

Remove

three

screws

in

capstan

assy.

6.

Gently

move

capstan

assy

up

and

down

until

it

slides

out

of

panel.

ewe

Fig.

4-7

Capstan

Assy

Removal

REMOVAL

OF:

TENSION

ARMS

LEFT

&

RIGHT?

———2———_—___-——_

See

illustration

for

complete

disassembly

instructions.

REMOVAL

OF:

REEL

MOTOR

ASSY

1.

Loosen

2

hex

screws

in

brake

drum,

lift

off

brake

drum.

2.

Remove

3

screws

securing

the

brake

assembly

to

the

motor.

3.

Remove

reel

turntable,

remove

4

screws

securing

motor

to

front

panel.

NOTE

Reel

motor

assemblies

are

mirror

images

of

each

other,

these

assemblies

are

not

interchangeable.

Fig.

4-8

Reel

Motor

Removal

5.HEAD

ALIGNMENT

—MECHANICAL—

ERASE

HEAD

SECTION

The

erase

head

pole

should

be

above

the

edge

of

a

threaded

tape

by

the

width

of

heavy

pencil

line.

RECORD

HEAD

SECTION

The

record

head

pole

should

be

above

the

edge

of

a

threaded

tape

by

the

width

of

a

thin

pencil

line.

PLAYBACK

HEAD

The

pole

of

the

playback

head

should

be

even

with

the

top

of

a

threaded

tape.

ORANGE

47.

4

Channel

A-3340

only

Fig.

5-1

Head

Alignment

Adjustable

Screws

NOTE

Azimuth

adjustments

are

given

in

the

section

on

MEASUREMENTS

AND

ADJUSTMENTS

—ELECTRICAL~